Before USMMA: Sellers was a four-year letterwinner at Pensacola High School and a member of the 2009 Florida State Class 3A State Chmpionship team. His team also reached the 2010 Class 3A Regional Final, the 2011 Class 6A Regional Final, and the 2012 Class 6A District Final. Sellers was named to the All-Area team as a senior and had the highest GPA on his high school football and baseball teams.